A) Closed circulatory system
B) Segmentation
C) Pseudocoelom
D) Ventral nerve cord
Correct Answer: C
Solution :
The name phylum-Annelida was first coined by Lamarck. The body of annelids is elongated, bilaterally symmetrical, triploblasric, truly coelomate and metamerically segmented into similar metameres. The coelom is true, schizocoelous. Blood vascular system is closed. The nervous system is with a pair of cerebral ganglia and a double ventral nerve cord bearing ganglia and lateral nerves in each segment. The blood vascular system consists of blood vessels and capillaries. Blood is composed of fluid plasma and colour less corpuscles, physiologically comparable to the leucocytes of vertebrates. Pseudocoelom is the body cavity of Aschelminthes.
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